OS0408 二軸引張試験機によるゴムの応力・ひずみ推定法に関する研究

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  • 山辺 純一郎
    九州大学水素エネルギー国際研究センター:産業技術総合研究所水素材料先端科学研究センター
  • 田中 史浩
    九州大学水素エネルギー国際研究センター:産業技術総合研究所水素材料先端科学研究センター
  • 西村 伸
    九州大学大学院工学研究院:産業技術総合研究所水素材料先端科学研究センター

書誌事項

タイトル別名
  • OS0408 Study on Estimation Method of Stress and Strain of Rubbers in Biaxial Tensile Tester

抄録

For identifying a constitutive model of an incompressible hyperelastic material such as rubber, tensile tests under three deformations (simple tension, pure shear and equibiaxial tension) are sometimes performed by using an in-plane biaxial tensile tester. In the typical in-plane biaxial tensile tester, uniform deformation is not obtained in a rubber specimen due to stress concentration caused by clamps; however, its influence is often ignored to calculate stress and strain at uniformly-deformed region in the specimen. This study indicates a method for accurately estimating stress and strain at the uniformly-deformed region in the specimen by using the typical biaxial tensile tester. A unique rubber specimen with holes was prepared based on the analysis by FEM; then, their tensile tests were performed under three deformations (simple tension, pure shear and equibiaxial tension). The experimental stress and strain data were successfully fitted by a polynomial Mooney-Rivlin model. A biaxial tensile test of a cross-shaped specimen was also performed, and the relationship between force and displacement of the specimen simulated by using material constants identified from the specimen with holes had a good agreement with the experimental one, different from that simulated by using material constants identified from a conventional specimen without holes.

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